Serial ata vs ultra

To get improved performance in this environment, it is logical to increase the strobe rate. A faster strobe means faster data transfer, but as the strobe rate increases, the system becomes increasingly sensitive to electro-magnetic interference EMI, also known as signal interference or noise which can cause data corruption and transfer errors. ATA-4 includes Ultra ATA which, in an effort to avoid EMI, makes the most of existing strobe rates by using both the rising and falling edges of the strobe as signal separators.

Thus twice as much data is transferred at the same strobe rate in the same time period. To eliminate this increase in EMI, a new pin, conductor cable was developed. This cable adds 40 additional grounds lines between each of the original 40 ground and signal lines. PATA has been the standard and has served well, but it has also had drawbacks.

Cables limited to 18 inches 46 cm in length often made connections difficult and also clogged cases blocking airflow, while cooling has become crucial.

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